function updateCheckbox(action,idm) {
	for(var i=1;;i++)
	{
		var elm = $('checkbox' + i);
		if(idm!='0') elm = $('.' + idm +' checkbox' + i);	
		if (!elm) break;	
		elm.checked = (action=='0') ? false : (action=='1') ? true : (elm.checked) ? false : true;
	}
}